diff --git a/include/clang-c/CXCppInterOp.h b/include/clang-c/CXCppInterOp.h
index d0511c35c..180edc1cd 100644
--- a/include/clang-c/CXCppInterOp.h
+++ b/include/clang-c/CXCppInterOp.h
@@ -1,5 +1,6 @@
 #ifndef CPPINTEROP_C_CXCPPINTEROP_H
-#define CPPINTEROP_C_CXCPPINTEROP_H
+#ifndef LLVM_CLANG_C_CXCPPINTEROP_H
+#define LLVM_CLANG_C_CXCPPINTEROP_H
 
 #include "clang-c/CXErrorCode.h"
 #include "clang-c/CXString.h"